Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 8
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Changes in Yield Stability: Wheat and Maize in Developing Countries AgEcon
Gollin, Douglas.
This study asks whether the diffusion of modern varieties has affected the yield stability of wheat and maize production in developing countries between 1960 and 2004. The data suggest strongly that, over the past forty-plus years, there has been a striking decline in the relative variability of grain yields in wheat and (to a lesser extent) maize. The declines are strongest when measured as the standard deviation of yield divided by the mean, but there have also been declines in other measures of variability, such as the percentage deviation from trend. Declines in yield variability do not appear to be driven by increases in intensification (e.g., irrigation), nor do they appear to extend to crops, such as oilseeds, in which there has been little...
Tipo: Conference Paper or Presentation Palavras-chave: Crop Production/Industries.
Ano: 2006 URL: http://purl.umn.edu/25239
Imagem não selecionada

Imprime registro no formato completo
Do Taxes on Large Firms Impede Growth? Evidence from Ghana AgEcon
Gollin, Douglas.
Many developing countries pursue policies that treat large and small firms differently. For example, large firms may be subject to a value added tax while small firms are explicitly exempted. Moreover, governments often find it impractical to collect taxes from the smallest enterprises; this may increase the tax burden for larger firms, whose compliance can be enforced. Such policies clearly affect the size distribution of firms. But how great is the impact on macro variables? How large are the resulting inefficiencies? And what are the dynamic effects on capital accumulation and economic growth? This paper uses a dynamic general equilibrium variant of the Lucas (1978) span-of-control model to address such questions. The model is matched to data from the...
Tipo: Working or Discussion Paper Palavras-chave: Public Economics.
Ano: 1995 URL: http://purl.umn.edu/7488
Imagem não selecionada

Imprime registro no formato completo
FARM WORK, HOME WORK AND INTERNATIONAL PRODUCTIVITY DIFFERENCES AgEcon
Gollin, Douglas; Parente, Stephen L.; Rogerson, Richard.
Agriculture’'s share of economic activity is known to vary inversely with a country’'s level of development. This paper examines whether extensions of the neoclassical growth model can account for some important sectoral patterns observed in a current cross-section of countries and in the time series data for currently rich countries. We find that a straightforward agricultural extension of the neoclassical growth model restricted to match U.S. observations fails to account for important aspects of the cross-country data. We then introduce a version of the growth model with home production, and we show that this model performs much better.
Tipo: Conference Paper or Presentation Palavras-chave: Agribusiness; Productivity Analysis.
Ano: 2000 URL: http://purl.umn.edu/21797
Imagem não selecionada

Imprime registro no formato completo
Impacts of International Research on Intertemporal Yield Stability in Wheat and Maize: An Economic Assessment AgEcon
Gollin, Douglas.
Tipo: Working or Discussion Paper Palavras-chave: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies.
Ano: 2006 URL: http://purl.umn.edu/7657
Imagem não selecionada

Imprime registro no formato completo
Optimal Search in Ex situ Collections of Wheat Genetic Resources AgEcon
Gollin, Douglas; Smale, Melinda; Skovmand, Bent.
This paper develops a theoretical model for analyzing gene bank management decisions regarding the search for traits of economic value in ex situ collections of wheat. The model is applied to data on the probability of finding useful sources of resistance to Russian wheat aphid (Diuraphis noxia) and septoria tritici leaf blotch, using Monte Carlo simulations for sampling distributions, simulations of varietal diffusion paths, and actual cost data from searches. Three specific questions are posed and answered: (1) what is the optimal size of search among genetic resources of a given type for a trait of economic value? (2) what is the value of specialized knowledge about which genetic resources are most likely to display resistance? and (3) how should search...
Tipo: Working or Discussion Paper Palavras-chave: Crop Production/Industries.
Ano: 1998 URL: http://purl.umn.edu/7695
Imagem não selecionada

Imprime registro no formato completo
SEARCH STRATEGIES AND THE VALUE OF A LARGE COLLECTION AgEcon
Gollin, Douglas; Smale, Melinda; Skovmand, Bent.
Tipo: Report Palavras-chave: Research and Development/Tech Change/Emerging Technologies.
Ano: 2003 URL: http://purl.umn.edu/16481
Imagem não selecionada

Imprime registro no formato completo
SEARCHING A GENE BANK: THE CASE OF WHEAT AgEcon
Gollin, Douglas; Smale, Melinda; Skovmand, Bent.
Using data on the distributions of disease and pest resistance among wheat varieties, this paper reports theoretical and empirical findings concerning the efficient management of a gene bank and the optimal size of a collection.
Tipo: Conference Paper or Presentation Palavras-chave: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies.
Ano: 1998 URL: http://purl.umn.edu/20879
Imagem não selecionada

Imprime registro no formato completo
The Food Problem and the Evolution of International Income Levels AgEcon
Gollin, Douglas; Parente, Stephen L.; Rogerson, Richard.
This paper examines the effect of agricultural development on a country’s overall development and growth experience. In most poor countries, large fractions of land, labor, and other productive resources are devoted to producing food for subsistence needs. This “food problem” can delay a country’s industrial development for a long period of time, causing its per capita income to fall far behind the world leader. Once industrialization begins, this trend is reversed. The extent to which a country catches up to the leader depends primarily on factors that affect productivity in non-agricultural activities: agricultural productivity is thus largely irrelevant in the very long run. But in the short run, a country that experiences large improvements in...
Tipo: Working or Discussion Paper Palavras-chave: Agriculture; Economic growth; Subsistence; Food problem; Agricultural technology; Long-run growth; Food Security and Poverty; E130; O400; O410; Q100.
Ano: 2004 URL: http://purl.umn.edu/28416
Registros recuperados: 8
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional